Piston-packing.



ffii) .subject of the UNITED STATES #ENT onirica.,

Piemon-PACKING. l

eri-i978.

' Another object of the invention is to provide an ciicient joint forpreventing the leaking oi'ItheHuid pressurepast the piston :it the jointot the packing rings.

A further-nbc@ of the invention is to provide asiinpie and efficientineansfor preventing the circumferential movement of the -`piston ringin its groove.

viththese 'and other objects in view which will appear vas the nature ofthe 1n- ,ventioii is better understood, the same conA sists in theconstruction, arrangementv and combination of parts hereinafter fullydescribed, pointed out in the appended claim aiidill-ustrated in theaccompanying drawings, it being understood 4 that various changes maybe' made in the size, proportion and construction, of partsiwithoutdepartingronithe spirit or sacrificing any of the" advantages of theinvention,

The invention 'is lillustrated in the accompanying drawings,in'wliic-lu- Figure 1 is a front elevation of a piston provided with apiston ring constructed in at 12. In the peripheral portion of the pis-4'lton is provided an annular groove 13, in-

vaccordance with the present invention; Fig. 2 is a 'sect-ion taken on-line 2, 2 of Fig. 1.; 141g. 3 is a section of the gap -closing cylinderof the piston ring; Figfjl is a section taken on line 4A, lo Fig. 3;Fig. 5 is a section of a piston having a iiiodiiied piston packingthereon; and Fig. (i is an end view of the gap closing cylinder, shownin lFig. 5 of the drawings. 1 g v- Referring now' more panticularly toFigs. L to 4, inclusive,of the drawings, the nun'ieral 10 indicates thepis-ton body, usually .a cylindrical member, providedwitli a cover 11',which is attached to, said body in a. Vwell known manner. The piston rodis indicated which is seated the pistonfring 111, which is ysplit at 15for obvious reasons. Thepiston Specification of Letters Patent.

State of New York, have.

interna Patented Oct. 4, 1910.

Application ledlay' 18, 1910. Serial No. 562,940'.

' ring is of a slight-ly larger diameter tlm-u the pist-on. 10, wherebythis ifi-iig will Wear leaving 'the piston itself intact.

pocket 16, leadiiij-g from th lits the gap closing block 17, which isalso of fi'ont face, which is Vcurved 'conforming` to in'der, a recess18, into which fit snugly the overlap thereby the Agap between the. twoends offthe piston ring, and effec-tively the passing ,of the from onehead of the piston to the other 'one'.

f fromthe Vouter periphery of die ring toward space formed b-y these twoedges is arranged cated in' the recess 18, and is, preferably, madeintegral with the cylindrical member 17. In the bore 24; of thecylindrical member 17 is located 4a spring 25, which 4bears against thesaid cylindrical member and the piston body.

It will be observed that tlieyrojection '23 does not extend-to the outer20, of the upper' and. lower wai-ls 19 'and Q0,

edges 21 and'. .QQ-of the piston ring ends,

each' other normally.

The operation of the The spring 25 forces the gap closing cylinder intocontact with the inner surface of elosinof cylinder, the upper and lower"walls 19 anc" 20 ot said recess will close the gap between the twoends` oitli i". l prevent ,thus the' fluid pressuii rom passing. throughsaid gap from one side ofthe ring to the other. The wedge-shapedprojection 23 of `che .gap closingicylinder 'prevents thecircumferential movement of the packing cylinder isiprevented since thewalslf) and v2O ofthe recess 18 are. made continuous.

As the faces 19 and 20 of the walls 19 and 2t) of the 'gap closingcylinder wear y env-1353i','the wedge 23 comes in contact with vIn thepistoni() is arrangeil'a cylindrical* cylindrical configuration, and'has in its" ices 19 and "respectively, and does. not contact with thej" whereby the said wedge 23 does not -tend to force the ends of' thepist'onring away from device is as follows:

4the cylinder,` whereby, isince the. resilient ring is seated 'infft-her ess 1li-of* the gapring. The` formation of the ridfres in the' .1602.'u v e groove 13l to# ward the axis of the piston. `Into this pocket '65the curvature of the inner surfaceof the cyl# two ends of the pistonriiig 14.,. The upper and lower walls 19 and 2 0 'ofthe recess 1S 701Eprevent thus uid pressure- Tlieends of the Ypiston ring 14 areytapered. VThe edgesl and 22 of these ends diverge" theinnen'peripheryof tbesaine. .In the'.

a wedge-shape`d projection 93, which is lo- 3g the saine. Y The 21 0fthe endsof the piston *nlfflatter-wears- 'with the faces-719 ,',gabovementioned. The object of, this arrngement is to reduce'tlie amount'of 5circiemntialmovement of the piston ring,

'increases in ring'eonstructions of the type as the ring. wears awayupon its outer' periphery. Since, however, `the wedge 23' advances as'the outer surface of l0 the-gapv closing cylinder wears awa'y, the

' t circumferential movement ofthe ring: is fpt'eonstant f 4 5 and v6 ofthe drawin s a modiicttion'ofthe-device lisillnstrate In this a dividedring is shown, consisting 'fireferablof three equal parts 26, 27 and'28,Whilch`are seated in the groove l294 in the piston'body 30. In'this'piston body are prov vided' cylindrical pockets 3,1, similarto'thosev 2o described .inconnection ""with the piston shown' in LFigs,1 and 2.' In'the pockets 3l are. arran"ed't-he ga closing cylinders. 32,which I die'r from'tiiose already described only infth'atthe saine arelnot rovided with 25 the bores: 24, but v'form solid blocks', in the'inner aoejs' of which are cut parallel grooves which fit the springs 35,which rested. in grooves 36 of the piston body,-and'fextendgaround ctheperiphery of iston ring sectlons are furth'erinore provldedV withinwardly eX- tending pro'ections 375, 37, having recesses 38, zlSVin 1te. 'inner faces thereof, which form additional for 'the springs 35.

.. The' operation-ofthe device shown in Figs.

and'of the drawings is exactly the 4same i course,4 the b of thestufiingv box.

split ring seated in said t l range as that of the device shown inFigs', 1 to 4,

inclusive.

It .will be observed that the gap closing blocks, herein described, canbe made use of boxes also. In that case, of

upon: stuliin docks are arranged in the walls 'What I clalm is: Thecombination with a piston having an annular roove in its peripheralportion and -a cylin rleal ocket leadin groove toward t e axis of Saipiston, of a groove, t e edges of eA endsl df said ring iverging fromthe outer periphery of the Same to the inner pe- .ripher lthereof, acylindrical member al.

in said pocket and having a recess into which the ends of 'said pistonring fit, vwhereby the wallspf said recess everla the gap between thetwofends of saidpiston ring, resilient means between said cylindricalmember and said'pist for forcing said rin outwardly, and av wedge-shapedprojection in said recess and in the s ace formed between the Idivergingledges o said rin said projection being shorter than the wal s 'ofsaidcylindrical member, whereby said projection is normally out ofcont-act with said ring. y

Signedvv at 14th day of May, A. D. `1910.

JOSEPH DITTRICH. v Witnesses:

S'IGMU'ND HERZOG, M. 'FRIEDLANDER' New York, in the county of New Yorkand State of New York, this from said

